Ing moisture upon the Andes, which thus rob the coast of its rainfall. But there is reason to believe that at one time the Andes were several thousand feet lower, and did not offer an insurmountable barrier to the rains. At this period the coast must have been wooded, and a forest must have stood where now is the waterless desert of Tarapaca, a forest of which the only traces are the numerous skeletons of anteaters which once it har boured. Further evidence of the gradual elevation of the country is afforded by the presence of beaches now raised many feet above the sea-level and some miles from the coast while it is evident that this elevation has been proceeding since the advent of man, since traces of his settlements have been discovered in these raised beaches. At points along the coast, however, a good deal of erosion has taken place and the victory has sometimes rested with the sea.